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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
519 | * Filters the widget instance's settings before displaying the control form. |
520 | * |
521 | * Returning false effectively short-circuits display of the control form. |
522 | * |
523 | * @since 2.8.0 |
524 | * |
525 | * @param array $instance The current widget instance's settings. |
526 | * @param WP_Widget $this The current widget instance. |
527 | */ |
528 | $instance = apply_filters( 'widget_form_callback', $instance, $this ); |
529 |
|
530 | $return = null; |
531 | if ( false !== $instance ) { |
532 | $return = $this->form($instance); |
533 |
|
534 | /** |
535 | * Fires at the end of the widget control form. |
536 | * |
537 | * Use this hook to add extra fields to the widget form. The hook |